add private flag to repository (no functionality yet)
Merge branch 'staging' into augmenting361_private_repositories
Merge branch 'staging' into augmenting361_private_repositories
Merge branch 'staging' into augmenting361_private_repositories
Merge branch 'correcting460_authorization' into augmenting361_private_repositories
merge with 460
change tests for private repository abilities
add new abilities for private repositories and make use of it
add test for deleting private flag
add model implementation of deleting reader permissions
add hint to form of private repos
filter accessible repositories
list private repositories in index
fix error in scope
authorize files controller
authorize ontology controllers
fix little errors
authorize more ontology controllers
change private_flag to is_private
add migrations (change private_flag to is_private)